Organized at Syracuse, N.Y.,
and mustered in as follows: Companies "A," "B,"
"C" August 8; "D," "F," "G,"
August 26; "E" August 15; "H" September 5;
"K" October 15; "I" November 30, 1863; "L"
January 20, and "M" January 24, 1864. Left State for
Washington, D.C. Companies "A" to "G" September,
1863. "H" and "K" October, 1863. "I"
November, 1863, and "L" and "M" January, 1864.
Attached to 22nd Army Corps, Dept. of Washington, D.C., to January,
1864. Cavalry Brigade, 1st Division, Army of West Virginia, to
April, 1864. 2nd Brigade, 1st Cavalry Division, Army of West Virginia,
to August, 1864. Remount Camp Cumberland, Md., to October, 1864.
2nd Brigade, 3rd Division, Cavalry Corps, Army of the Shenandoah,
and Army of the Potomac to June, 1865.

May 29, 1863, Col. Robert M. Richardson received authority
to reorganize the I2th N. Y. Volunteer Infantry, discharged by reason of
expiration of its term of service, as a regiment of cavalry. The regiment was
organized at Syracuse for a service of three years, and the companies were
mustered in the service of the United States at Syracuse, A, B and C August 8;
D, F and G August 26; E August 15; H September 5; K October 15; at the Cavalry
Depot, D. C., Company I November 30, 1863; and at Elmira, Companies L and M
January 20, and 24, 1864, respectively.

Companies A, B, C and E left the State September 2, 1863; D, F and G later in
September ; H and K in October ; I in November, 1863 ; and L and M in January,
1864 ; and the regiment served at Camp Stoneman, and in 22(1 Corps, Department
of Washington, Va., from September, 1863; in the 2d Brigade, ist Division,
Cavalry of West Virginia, from January, 1864; at Cumberland, Md., Remount Camp,
from August 25 to October, 1864, and while there was assigned to the 2d Brigade,
3d Division, Cavalry Corps, Army of the Potomac; in the Army of the Shenandoah
from October, 1864; with the Army of the Potomac from March, 1865.

June 17, 1865, the regiment, commanded by Col. John J. Coppinger, was
consolidated with the 6th N. Y. Volunteer Cavalry, the consolidated force
receiving the designation, 2d Provisional Regiment, N. Y. Volunteer Cavalry, the
I5th Regiment being consolidated into four companies, which became Companies F,
G, H and K of the new organization. During its service, the regiment lost
by death, killed in action, 3 officers, 18 enlisted men; of wounds received in
action, 19 enlisted men; of disease and other causes, 4 officers, 126 enlisted
men; total, 7 officers, 163 enlisted men; aggregate, 170; of whom 44 enlisted
men died in the hands of the enemy.

SERVICE.--Duty at Camp Stoneman,
Defenses of Washington, until January, 1864. Action at Hillsboro,
Va., January 22. Operations in Hampshire and Hardy Counties, West
Virginia, January 27-February 7. Upperville February 20. Expedition
to Petersburg and destruction of Salt Works near Franklin, West
Va., February 29-March 5. Sigel's Expedition from Martinsburg
to New Market April 30-May 16. Moorefield May 12. Luray Gap, Mt.
Jackson, and near New Market May 13. New Market May 14-15. Front
Royal May 22. Newtown May 25. Hunter's Raid to Lynchburg, Va.,
May 26-July 1. Woodstock May 27. Newtown May 29-30. Mt. Jackson
June 4. Piedmont June 5, Occupation of Staunton June 6. Waynesboro
June 10. Lexington June 11. New London June 16. Diamond Hills
June 17. Lynchburg June 17-18. Liberty June 19-20. Catawba Mountains
and Salem June 21. Newtown June 28. Bunker Hill July 2. Bolivar
Heights July 2. Leetown and Martinsburg July 3. Near Hillsboro
July 15-16. Snicker's Ferry July 17-18. Ashby's Gap and Berry's
Ford July 19. Near Kernstown July 23. Kernstown, Winchester, July
24. Bunker Hill and Martinsburg July 25. Strasburg August 11.
Near Charlestown August 21-22. Ordered to Cumberland, Md., August
24, and duty at Remount Camp until October. Green Springs Run
November 1 (Detachment). Expedition to Lacy Springs December 19-21.
Lacy Springs December 21. Near Harrisonburg December 31. Sheridan's
Raid from Winchester February 27-March 25, 1865. Waynesboro March
2. Occupation of Staunton March 2. Charlottesville March 3. Ashland
March 15. Appomattox Campaign March 28-April 9. Dinwiddie Court
House March 30-31. Five Forks April 1. Fall of Petersburg April
2. Namozine Church April 3. Jettersville April 4. Sailor's Creek
April 6. Appomattox Station April 8. Appomattox Court House April
9. Surrender of Lee and his army. Expedition to Danville April
23-29. March to Washington, D.C., May. Grand Review May 23. Consolidated
with 6th New York Cavalry June 17, 1865, to form 2nd Regiment
Provisional Cavalry.

Regiment lost during service
2 Officers and 35 Enlisted men killed and mortally wounded and
5 Officers and 126 Enlisted men by disease. Total 168.